Measurement of the Top Quark Mass Using the Matrix Element Technique in Dilepton Final States

TL;DR

This paper measures the top quark mass using a matrix element technique in dilepton final states at the Fermilab Tevatron, achieving a precise value with reduced systematic uncertainties.

Contribution

It applies the matrix element method to dilepton ttbar events and calibrates jet energies using lepton+jets data to improve measurement accuracy.

Findings

Top quark mass measured as 173.93 GeV

Reduced systematic uncertainties through jet energy calibration

Achieved a total uncertainty of 1.84 GeV

Abstract

We present a measurement of the top quark mass in ppbar collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider. The data were collected by the D0 experiment corresponding to an integrated luminosity of 9.7 fb-1. The matrix element technique is applied to ttbar events in the final state containing leptons (electrons or muons) with high transverse momenta and at least two jets. The calibration of the jet energy scale determined in the lepton + jets final state of ttbar decays is applied to jet energies. This correction provides a substantial reduction in systematic uncertainties. We obtain a top quark mass of mt = 173.93 +- 1.84 GeV.